Firebird is a relational database offering many
ANSI SQL-99 features that runs on Linux, Windows,
and a variety of Unix platforms. It offers
excellent concurrency, high performance, and
powerful language support for stored procedures
and triggers.

LibSylph is a cross-platform C++ library for basic utility and data processing. It has classes and methods that facilitate reading, writing, processing, and sharing data in various kinds of formats. It includes frameworks for IPC and RPC, socket programming, plugin systems, etc.

Forxx is a language for text processing, inspired by Forth and REXX. It is a stack-based, extensible language which provides both an interactive environment and the ability to compile and run programs.